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Issue:ISSN 1006-5539
          CN 51-1183/TE


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Complex Acidizing Technique for Water-injecting Wells in Zhenbei Oilfield
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Key Words:Water-injecting Wells; Secondary Precipitation; Complex Acidification; Simulation Experiment; Field Application
Abstract:ZhenBei oilfield has the problems of high injection pressure and difficulty in injecting water for water-injecting wells. To solve it, preliminary work included the performance evaluation of additives added into acidizing fluids, and then proposed a complex acidizing formula aiming at damage removal. To evaluate the character of this complex formula, three groups of experimental were conducted to study on fluids ability to remove damage resulted from water injection and performance of improving cores permeability. These experimental is:displacing fluid→oilfield reinjection water→pre-flush→main fluid→after-pad→displacing fluid. The results showed that both of the oilfield reinjection water and pre-flush can take toll on cores permeability, and the smaller the cores initial permeability is, the damage will be severer. However, pre-flush and main fluid are able to dissolve the solvable mineral particles in cores and react chemically with micro-particulates in water so as to recover and improve permeability of cores highly. Applications from oilfield showed the treatments applied to three test wells removed well-bore damage. The pressure of water injection obviously reduced and the step-down was highly stronger than former treatments.
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